ANALYSIS OF MICROPOROSITY AND SETTING OF REACTIVE POWDER CONCRETE BY PROTON NUCLEAR-RELAXATION

The proton spin-lattice relaxation measured at several frequencies lea ds to a resolved distribution of four T-li for reactive powder concret e (RPC). The typical T-li frequency dependences are quantitatively int erpreted by a biphasic fast exchange model and a proton nuclear relaxa tion of hydrated paramagnetic ions at the surface of the pores. This l eads to an estimation of the pore sizes. We present the first applicat ion of this nuclear relaxation method to follow in !;itu the kinetics of the hydration and setting of such material. (C) 1998 Elsevier Scien ce Inc.